. >>> police say they don't yet know why kansas city chiefs linebacker jovan belcher killed hi his girlfriend and then killed himself. we're at kansas city's arrowhead stadium where belcher's teammates played a game on the day after this murder suicide. manuel, good morning. >> reporter: good morning, norah. the chiefs' coach said it was teammates themselves who helped him decide to go ahead with eesterday's game. if for no other reason than to few their minds off the tragedy hor just a few hours. the kansas city chiefs beat the panthers panthers, 27-21, on sunday. tion -- ne, had they got that completion on the sidelines. >> reporter: but the win was no match for what their team had lost lost. a it's not easy. he was a friend, a brother. >> reporter: on saturday, police say 25-year-old linebacker jovan his er shot and killed kasandra perkins, his girlfriend and the mother of his 3-month-old 3-mo daughter at their home. he then drove to the chiefs' practice facility. o the parking lot he met and thanked the team's general in t manager and coach, romeo hennel, for all they had done. >> he's go